Secure Endpoint and ClamAV
CVE-2024-20506: ClamAV Privilege Handling Escalation Vulnerability
A vulnerability in the ClamD service module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an authenticated, local attacker to corrupt critical system files.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| ClamAV 1.4 | See the advisory |
| ClamAV 1.3 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.0 | See the advisory |
| ClamAV 1.2 | See the advisory |
| ClamAV 0.105 | See the advisory |
| ClamAV 0.104 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
| ClamAV 0.103 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in the ClamD service module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an authenticated, local attacker to corrupt critical system files.
The vulnerability is due to allowing the ClamD process to write to its log file while privileged without checking if the logfile has been replaced with a symbolic link. An attacker could exploit this vulnerability if they replace the ClamD log file with a symlink to a critical system file and then find a way to restart the ClamD process. An exploit could allow the attacker to corrupt a critical system file by appending ClamD log messages after restart.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.